Description (English)
Shanghai Vertex Alloy Co., Ltd (Vertex Alloy) supplies AISI 4140 (42CrMo4 / SCM440 / DIN 1.7225) custom machined parts manufactured to your drawing or sample. In-house capabilities: CNC turning Ø 5–400 mm, 3/4/5-axis milling, grinding to ±0.005 mm, deep-hole drilling Ø 4–60 mm; heat treatments: Q&T 28–34 HRC, induction hardening 52–56 HRC, nitriding HV 900+; surface treatments: black oxide, zinc plating, phosphate, hard chrome. Tolerance ±0.01 mm, MOQ 1 piece, EN 10204 3.1 certificates with 100% dimension and hardness inspection. Reverse engineering from worn parts without drawing is available. Widely used for machinery shafts and gears, oil & gas valve parts, automotive axles, hydraulic piston rods, mold components and high-strength fasteners.
Size Range
- CNC Turning Diameter:Ø 5–400 mm
- Turning Max Length:1,000 mm
- Milling Envelope:1,200 × 600 × 600 mm
- Grinding Tolerance:±0.005 mm
- Drilling / Tapping:M2–M48
- Deep Hole Drilling: Ø 4–60 mm
- Part Weight:0.01–500 kg
Grade Specification
| System | Value |
|---|---|
| USA (ASTM/SAE) | AISI 4140 / UNS G41400 |
| Germany / EU (EN) | 42CrMo4 / DIN 1.7225 |
| Japan (JIS) | SCM440 |
| China (GB) | 42CrMo |
| ISO | 42CrMo4 |
Chemical Composition
| Element | Value |
|---|---|
| C | 0.38–0.43 |
| Si | 0.15–0.35 |
| Mn | 0.75–1.00 |
| Cr | 0.80–1.10 |
| Mo | 0.15–0.25 |
| P | ≤ 0.035 |
| S | ≤ 0.040 |
| Fe | Balance |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 950 MPa |
| Yield Strength | ≥ 750 MPa |
| Elongation | ≥ 12% |
| Reduction of Area | ≥ 45% |
| Hardness (Q&T) | 28–34 HRC |
| Max Hardness (Quenched) | up to 54 HRC |
| Impact Energy (KV, 20°C) | ≥ 47 J |
Physical Properties
| Property | Unit | Value |
|---|---|---|
| Density | - | 7.85 g/cm³ |
| Elastic Modulus | - | 205 GPa |
| Thermal Conductivity | - | 42.6 W/(m·K) at 100°C |
| Specific Heat | - | 473 J/(kg·K) |
| Electrical Resistivity | - | 0.22 µΩ·m |
| CTE (20–100°C) | - | 12.2 × 10⁻⁶ /K |
| Poisson's Ratio | - | 0.29 |
Applications
- Machinery:Shafts
- Machinery:Spindles
- Machinery Gears & pinions
- Oil & Gas Valve parts
- Oil & Gas Drill tool components
- Oil & Gas Pump shafts
- Automotive Axles
- Automotive Steering knuckles
- Hydraulics Cylinder rods & piston rods
- Hydraulics Fittings
- Molds & Tooling Die holders & wear inserts
- Fasteners High-strength bolts 10.9 / 12.9
- Mining / Construction Rollers & undercarriage pins
- Plastics Machinery Screws, barrels, tie bars